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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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  <body>
    <!-- 步骤 
    1. 安装工具 babel-cli babel-preset-env browserify(打包工具)
    2. 编译输出文件
    npx babel src/js -d dist/js --presets=babel-preset-env
    3. 打包
    npx browserify dist/js/app.js -o dist/bundle.js
  -->
    <script src="dist/bundle.js"></script>
  </body>
</html>
